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[PR #5277] Use grayscale AA always on non-opaque backgrounds #26223

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opened 2026-01-31 09:14:45 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 09:14:45 +00:00
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Original Pull Request: https://github.com/microsoft/terminal/pull/5277

State: closed
Merged: Yes

Summary of the Pull Request

When we're on acrylic, we can't have cleartype text unfortunately. This PR changes the DX renderer to force cleartype runs of text that are on a non-opaque background to use grayscale AA instead.

References

Here are some of the URLS I was referencing as writing this:

Additionally:

  • This was introduced in #4711

PR Checklist

Detailed Description of the Pull Request / Additional comments

Basically, if you use cleartype on a light background, what you'll get today is the text foreground color added to the background. This will make the text look basically invisible.

So, what I did was use some trickery with PushLayer to basically create a layer where the text would be forced to render in grayscale AA. I only enable this layer pushing business when both:

  • The user has enabled cleartype text
  • The background opacity < 1.0

This plumbs some information through from the TermControl to the DX Renderer to make this smooth.

Validation Steps Performed

Opened both cleartype and grayscale panes SxS, and messed with the opacity liberally.

**Original Pull Request:** https://github.com/microsoft/terminal/pull/5277 **State:** closed **Merged:** Yes --- ## Summary of the Pull Request When we're on acrylic, we can't have cleartype text unfortunately. This PR changes the DX renderer to force cleartype runs of text that are on a non-opaque background to use grayscale AA instead. ## References Here are some of the URLS I was referencing as writing this: * https://stackoverflow.com/q/23587787 * https://docs.microsoft.com/en-us/windows/win32/direct2d/supported-pixel-formats-and-alpha-modes#cleartype-and-alpha-modes * https://devblogs.microsoft.com/oldnewthing/20150129-00/?p=44803 * https://docs.microsoft.com/en-us/windows/win32/api/d2d1/ne-d2d1-d2d1_layer_options * https://docs.microsoft.com/en-us/windows/win32/direct2d/direct2d-layers-overview#d2d1_layer_parameters1-and-d2d1_layer_options1 * https://docs.microsoft.com/en-us/windows/win32/api/dcommon/ne-dcommon-d2d1_alpha_mode?redirectedfrom=MSDN#cleartype-and-alpha-modes * https://stackoverflow.com/a/26523006 Additionally: * This was introduced in #4711 ## PR Checklist * [x] Closes #5098 * [x] I work here * [ ] Tests added/passed * [n/a] Requires documentation to be updated ## Detailed Description of the Pull Request / Additional comments Basically, if you use cleartype on a light background, what you'll get today is the text foreground color _added_ to the background. This will make the text look basically invisible. So, what I did was use some trickery with `PushLayer` to basically create a layer where the text would be forced to render in grayscale AA. I only enable this layer pushing business when both: * The user has enabled cleartype text * The background opacity < 1.0 This plumbs some information through from the TermControl to the DX Renderer to make this smooth. ## Validation Steps Performed Opened both cleartype and grayscale panes SxS, and messed with the opacity liberally.
claunia added the pull-request label 2026-01-31 09:14:45 +00:00
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